dom/media/mp4/SinfParser.h

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this
   3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 #ifndef SINF_PARSER_H_
   6 #define SINF_PARSER_H_
   7
   8 #include "mozilla/ResultExtensions.h"
   9 #include "Atom.h"
  10 #include "AtomType.h"
  11 #include "nsTArray.h"
  12
  13 namespace mozilla {
  14
  15 class Box;
  16
  17 class Sinf : public Atom {
  18  public:
  19   Sinf()
  20       : mDefaultIVSize(0),
  21
  22         mDefaultCryptByteBlock(0),
  23         mDefaultSkipByteBlock(0) {}
  24   explicit Sinf(Box& aBox);
  25
  26   bool IsValid() override {
  27     return !!mDefaultEncryptionType &&  // Should have an encryption scheme
  28            (mDefaultIVSize > 0 ||       // and either a default IV size
  29             mDefaultConstantIV.Length() > 0);  // or a constant IV.
  30   }
  31
  32   uint8_t mDefaultIVSize;
  33   AtomType mDefaultEncryptionType;
  34   uint8_t mDefaultKeyID[16];
  35   uint8_t mDefaultCryptByteBlock;
  36   uint8_t mDefaultSkipByteBlock;
  37   CopyableTArray<uint8_t> mDefaultConstantIV;
  38 };
  39
  40 class SinfParser {
  41  public:
  42   explicit SinfParser(Box& aBox);
  43
  44   Sinf& GetSinf() { return mSinf; }
  45
  46  private:
  47   Result<Ok, nsresult> ParseSchm(Box& aBox);
  48   Result<Ok, nsresult> ParseSchi(Box& aBox);
  49   Result<Ok, nsresult> ParseTenc(Box& aBox);
  50
  51   Sinf mSinf;
  52 };
  53
  54 }  // namespace mozilla
  55
  56 #endif  // SINF_PARSER_H_